Hi,
If one wants to create an extra analog output signal for an amplifier, subwoofer or headset or a 2nd room amplifier then one typically has to deal with a common ground.
However, the TAV5709 has a BTL output. In such a case I would normally use a following configuration. Take the plus outputs of both the channels (OutA and OutC) and offer them as the left and right channel + signal. Then use the ground as common ground or - signal.
Is there any risk is such configuration?
Would it make sense to use a resistance and a capacitor before offering it as output to reduce power output and avoid dc current flowing to the ground ? If so, what are the recommendation for the resistance and res. capacitor ?
Thank you so much.
Oscar